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Glacial markings, Burlington, Iowa, late 1890s or early 1900s
Heaving of ice along margin of Clear Lake, Iowa, late 1890s or early 1900s
Buchanan gravels, vertical view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s
The Sentinel and Sleeping Boulders, Newton Township, Iowa, late 1890s or early 1900s
Buchanan gravels with boulders of Iowan stage, Illinois Central Gravel Pit, Independence, Iowa, late 1890s or early 1900s
Buchanan gravels, horizontal view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s
Iowan boulders overlying Buchanan Gravels, Independence, Iowa, late 1890s or early 1900s
Man next to large Wisconsin boulder near the mouth of Prairie Creek, Iowa, late 1890s or early 1900s
Stratified silt below Illinoian Drift, Muscatine, Iowa, late 1890s or early 1900s
Alpine Glaciers, late 1890s or early 1900s
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